Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 80, Issue 7, Pages -Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.80.073702
Keywords
layered iron pnictide; superconductor; Ba(Fe0.9Co0.1)(2)As-2; elastic softening
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Funding
- Ministry of Education, Culture, Sports, Science and Technology of Japan [18002008]
- Grants-in-Aid for Scientific Research [18002008, 21340097, 09J03458, 23654116] Funding Source: KAKEN
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Elastic constant measurements on iron pnictide Ba(Fe0.9Co0.1)(2)As-2 with an optimal superconducting transition temperature of T-SC = 23 K have been performed by the ultrasonic pulse echo method. The shear elastic constant of C-66 associated with elastic strain epsilon(xy) reveals considerable softening of 21% below 300 K down to T-SC and becomes increasing in the superconducting phase below T-SC, while other shear elastic constants of (C-11 -C-12)/2 and C-44 show no sign of softening below 80 K down to 4.2 K. The electric quadrupole O-v' existing in the degenerate d(y'z) and d(zx') bands participates in the superconductivity of the present iron pnictide system.
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